Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pasj...50..639f&link_type=abstract
Publications of the Astronomical Society of Japan, v.50, p.639-652.
Astronomy and Astrophysics
Astronomy
11
Accretion, Accretion Disks, Convection, Stars: Neutron
Scientific paper
To examine subcritical accretion disks, we performed two-dimensional axisymmetric calculations by solving a set of fully non-linear hydrodynamic equations coupled with radiation transport. Focusing on the accretion disks of neutron stars near to the Eddington luminosity L_E, we obtained thermally stable accretion disks where the radiation pressure and electron scattering are dominant. The thermally stable disks are interpreted in terms of the slim accretion-disk theory. While the accretion disks are unstable to convection and convective cells generally stretch from the disk mid-plane to the disk surface in the inner disk. It has been found that convection is an important energy-transfer mechanism along the vertical direction of the disk. A very rarefied, hot, and optically thin region is formed along the rotational axis of the disk. The relativistic jet with a collimation angle of less than 10(deg) is generated in the rarefied optically thin region, mainly due to the dominant radiation-pressure force. The results of subcritical accretion onto a neutron star are discussed in relation to SS 433.
Fujita Mitsutaka
Okuda Toru
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